1958 photograph is from part of the valve mass production assembly
line at one of the Siemens Ediswan Sunderland Factories.
I count at least thirty lines of 14 workers
- meaning there must have been at least 420 people in one room! How
did they all clock out?
I have seen exactly the same photograph in
the 1964/5 Mazda data book captioned
"Assembling Mazda valves at Sunderland "A" Factory"!
You can also see the same image on this link.